I live in Canada, its not illegal to modify it here. I assume though because you are US based you still can't do it?

I've been throwing CEL codes since installing high flow cats. I just ignore them but that could lead to something worse if I missed a real CEL problem.

2009 Challenger SRT8.

I did the install with the predator but I don't think it took.

The ignition was on (maybe thats my error?), I plugged it in, selected tune, accepted disclaimer, chose the 91 octane CAI tune, then it did a backup which took quite a while, verified the backup, I selected the ...